linux-kernel - Re: threadlets as 'naive pool of threads', epoll, some measurements

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Date:	Mon, 26 Feb 2007 11:45:07 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Evgeniy Polyakov <johnpol@....mipt.ru>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@....com.au>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Ulrich Drepper <drepper@...hat.com>,
	Zach Brown <zach.brown@...cle.com>,
	"David S. Miller" <davem@...emloft.net>,
	Suparna Bhattacharya <suparna@...ibm.com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: threadlets as 'naive pool of threads', epoll, some measurements


update:

> i have tried the one Evgeniy provided in the URL:
> 
>   http://tservice.net.ru/~s0mbre/archive/kevent/evserver_epoll.c
> 
> and 'ab -k -c8000 -n80000' almost always aborts with:
> 
>   apr_socket_recv: Connection reset by peer (104)
> 
> in the few cases it finishes, i got the following epoll result, over 
> gigabit ethernet, on an UP Athlon64 box:
> 
>    eserver_epoll:     7800 reqs/sec

eserver_epoll.c had a number of bugs. The most serious one was the 
apparently buggy use of "EPOLLET" (edge-triggered events). Removing that 
and moving epoll to level-triggered (which is slower but does not result 
in missed events) gives:

   eserver_epoll:       9400 reqs/sec

> the same with the most naive implementation of the same, using 
> threadlets:
> 
>    eserver_threadlet: 5800 reqs/sec

   eserver_epoll_threadlet:   9400 reqs/sec

as expected, the level of extra blocking triggered by this is low - even 
if the full request function runs without nonblock assumptions.

	Ingo
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